Yes. In fact it will be so hard that you are guaranteed to fail. And then the failing domino effect will begin, and continue until you have to drop out of dental school.
HELLO what do you think??? Of course it will be harder for you then people who have already done it. So you will have to sit down and work your butt off like you will have to for every class in dental school. Why ask such questions?
it'll be tuff but managable. heck, you might even pick up on it pretty well and it wont be such a big deal. if you've had molecular cell/genetics/phys/etc then you've seen most of the material before. don't sweat it.